Plankton communities in the Jankovac stream artificial lakes (Papuk)

Šargač, Jasmina (2010) Plankton communities in the Jankovac stream artificial lakes (Papuk). Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Research was conducted on lotic (JI, JS) and lentic (J1, J1M, J2, J2M) study sites on the longitudinal profile of Jankovac stream (Nature Park Papuk) from May until October 2008. Main hypothesis in this study was that the hidrological features of running waters and the percentage of macrophytes cover have significant influence on development, production and biodiversity of plankton communities. Aims of this study were: 1. to analyze qualitative and quantitative structure of zooseston on lotic and lentic study sites; 2. to analyse influence of current velocity on organisms size categories; 3. to analyse transport of seston on lotic and lentic stations; 4. to analyse the effect of physical and chemical factors on seston structure in running waters. There were significant differences (p<0,05) between lotic and lentic study sites in physical and chemical factors. Lotic stations consisted mostly of inorganic particles (average 1,76 ± 0,64 mg/L), while lentic stations had higher amount of organic particles (average 8,85 ± 15,98 mg/L). A total of 95 taxa were identified among them: Rotifera 63, Cladocera 17 and Copepoda 10 taxa. Lotic study sites achieved higher contribution of benthic organisms (56-98%) whereas lentic stations consisted mostly of euplanktonic (20-99%) and semiplanktonic organisms (20-80%). The major part in zooseston biomass (44%) constituted organisms with body size from 1000 to 1500 μm, i.e. Cladocera, Copepoda and Oligochaeta. Rotifers mainly contributed to organisms biomass with body size, from 45 to 500 μm. In Jankovac stream lentic habitats with longer period of water retention contributed to development of numerous plankton community. Macrophyte zones in lentic part of running wters represent very productive habitats with maximum biodiversity and density. Also, macrophyte zones are the main habitats of production and provide sufficient amount of food for downstream benthic organisms.

Item Type: Thesis (Diploma thesis)
Keywords: lotic, lentic, zooseston, submergent macrophytes
Supervisor: Špoljar, Maria
Date: 2010
Number of Pages: 60
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 03 Sep 2014 13:14
Last Modified: 18 Sep 2014 08:32
URI: http://digre.pmf.unizg.hr/id/eprint/2620

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